Radiant heater



M. H. SHOENBERG AND G. J. HENRY.

RADIANT HEATER.

APPLICATION FILED OCT. 1. 1919.

Patented 001. 11, 1921.

INVENTOR. mJ/vk '18:.

ATTORNEYS.

' parallel lines, and in such case we form the UNITED STATES PATENT OFFICE.

MILTON H. SHOENBERG AND GEORGE J. HENRY, OF SAN FRANCISCO, CALIFORNIA.

RADIANT Emma.

Specification of Letters Patent.-

Patented Oct. '11, 1921.

Application filed October 1, 1919. SeriaLNo. 327,711.

' on which the reflecting surfaces are formed,

and therefore in the general direction of the axis of the reflectors curved surfaces.

In forming the reflectors use may be made of the well established principle of the parabola whereby radiant energy originating at its focus is reflected from all parts of the parabolic curve of the reflector surface, in

reflector of our heater, as the surface generated by a parabola rotating about its directrix, and form and locate the heating element, from which emanates the radiant energy, in circular form generated by the rotation of the focus of the reflectors curve. The zone of radiant energy reflected from the reflector will then be of a thickness equal to the maximum chord of the parabolic section parallel with the dielectric and extending radially out therefrom in'planes substantially parallel to the plane through the heat element.

'If it be desired that the zone of radiant heat from the reflector diverge so as to have a greater thickness as it proceeds outward, the curved surface of the reflector may be made other than that of a parabola of rev--' olution, and in fact of any suitable concavity. The same result may also be attained by making the heating element larger but in any event it should be located centrally about the'focal circle, or circle generated by the rotation of the focal oint. In such case the radiant energy origmating at o-ints adjacent to but slightly displaced rom the focal circle, will result in a divergence of the emanating waves, so that when the heater is used in the ordinary room the space within 'whichthe radiant waves will impinge upon objects, will be that portion in which a person will ordinarily move, and no waves of*energy will impinge in the upr strata. By this form of heater, thereore, we attain the most efiective distribution of radiant heat within any room, or space.

. The form last described is that chosen for lllustration. By referring to the accomplanying figures the invention will be made 0 ear. r

Figure 1 is a plan partly in section of the heater.

Fig. 2 is a side view and section of the assembled heater. a

The base of the heater is shown by the numeral 1, and a suitable top is formed at 2. Between the baseand the top is a curved refleeting element 3, and associated therewith,

but inversed thereto, is a second element 4.

These two parts 3 and 4 are separated merely for the purpose of facilitating the assembly of the heat element and its connectlons, and their surface preferablyforms substantially a continuous curve when seen in cross section, as shown in Fig. 2.

Mounted about the lower portion of 3 and on the base 1 is a ring 5, within which is assembled one end of the guard wires as 6, 7, 8, the opposite end of the said wires being preferably fixed on the ring 9, which is'retained in position between the upper part of the reflector 4 and the top or cap 2. Between 3 and 4 is assembled the supportlng frame 11, carrying the heater element 10. Thls frame is preferably made of insulating material and is centrally drilledfor the rod 12, which rod is adapted to engage by a screw thread at 13 with the base 1, and at 14: it is adapted to clamp with the cover 2, thus holding in compression, and consequently retaining the assembly of the two part reflector 3, 4,'the wirecage 6, 7, 8, through its rings 5 and 9, and the heating element by 1ts supporting plate 11. The ring 15 at the top of the rod 12 may be used to suspend the heater, or it may be supported on a table by the base 1. The cord 16 indicates asupply of: electrical energy, which cord is divi ed through the insulating plate 11 at the holes 17; 18, and there connected under the binding screws 19, 20 to distribute electrical energy to the resistance wire or .heat coil 10.

The reflector 3, 4, mathematically, is a surface of revolution about the directrix 12, although not the axis in the mathematical acceptance of the term of thelparabola, or other curve seen in the cross section of Fig. 2. This reflector is herein shown as constructed in two parts for simplicity of manufacture and machine design. Each part may be spun separately upon a mandrel, and one of the parts may be formed with an overhanging flange, as shown at 21 to retain alined engagement with the opposite part as 3, also the plate 11 may be formed with an annular bend or recess as at 22, adapted to engage the part 3 or 4 and retain it equidistant from the center as 12. The hole 23 will then retain the heater element 10 concentric with the reflector and central rod 12.

It will be observed that it is not necessary that the curves 3 and 4 should be parallel as they may be formed of different parabolas or be other curves and on different radii in order to direct the zone of radiant heat as required.

In the figures the heating element 10 will radiate from the points of origin of heat energy, asfrom its inner diameter and outer diameter, and such radiant waves will emanate from the reflector surface in slightly diverging lines, and the reflector curves may be formed such that, from the curve 3, the beam may be directed substantially horizontally at its lower limit as indicated at 24:, and in a somewhat upward direction from the surface of reflector 4 as indicated at 25.

With our heater therefore, perfect control of the diverging heat zone may be effected through the shape, dimensions and position of the heating element and the curvature, and its relation to the heat element of the upper and lower reflector,

While we have shown the reflector as made in two parts and with two parabolas (in cross section) we do not wish to be confined to this, as the reflector may be made with, a single unbroken surface,'or of other curve or curves, and the heat element may be mounted in other ways than from the center of the reflector. The guard wires may be of other shapes, or may -e left ofl'ventirely.

The heating element may be made as an annulus or as any other figure, and the base or top or other parts maybe to suit the taste or requirements of individual application without departing from our invention.

We claim:

1. A radiant heater consisting of a reflector formed with a concave surface of revolution; and a heat element disposed within the concavity formed by the reflector.

2. A radiant heater consisting of a reflector formed with a concave surface of revolution; and a heat element disposed within the concavity formed by the reflector of annular form.

3. A radiant heater consisting of a reflector formed with a concave surface of revolution; and a heat element disposed within the concavity formed by the reflector of annular form, and about the focus of the concavity.

4. A radiant heater consisting of a reflector formed with a concave surface of revolution; and a heat element disposed within the concavity formed by the reflector, said heat element, consisting of an electrical resistance in combination with the source of electrical supply and connections to said heat elenient- 5. A radiant heater consisting of a reflector formed with a concave surface of revolution; and a heat element disposed within the concavity formed by the reflector of annular form, said heat element consisting of an electrical resistance in combination with the source of electrical resistance in combination with the source of electrical supply and connections to said heat element.

6. A radiant heater consisting of a reflector formed with a concave surface of revolution; and a heat element disposed within the concavity formed by the reflector of annular form; and about the focus of the con cavity, said heat element consisting of an electrical resistance in combination with the source of electrical supply and connections to said heat element.

7. A radiant heater consisting of a reflector formed with a concave surface of revolution, and a heat element disposed within the concavity formed by the reflector, and a protective cage surrounding the heat element and the reflecting surface.

8. A radiant heater consisting of a re flector formed witha concave surface of revolution; and a heat element disposed within the concavity formed by the reflector of annular form, and a protective cage surround- :iEng the heat element and the reflecting surace.

' 9. A radiant heater consistin of a reflector formed with a concave sur ace of revolution; and a heat element disposed within the concavity formed by the reflector of annular form, and about the focus of the concavity, and a protective cage surrounding the heat element and the reflecting surface.

10. A radiant heater consisting of a reflector formed with a concave surface of revolution; and a heat element disposed within the concavity formed by the reflector, said heat element consisting of an electrical resistance in combination with the source of electrical supply and connections to said heat element, and a protective cage surrounding the heat element and the reflecting surface.

11. A radiant heater consisting of a reflector formed with a concave surface of revolution; and a heat element disposed within the concavity formed by the reflector of annular form, said heat element consisting of an electrical resistance in combination with the source of electrical supply and connections to said heat element, and a protective cage surrounding the heat element and the reflecting surface.

12., A radiant heater consisting of a :re-

flector formed with a concave surface of revthe concavity formed by the reflector, of annular form, and about the focus of the concavity, said heat element consisting of an electrical resistance in combination with the source of electrical supply and connections to said heat element, and a protective cage surrounding the heat element and the reflecting surface.

13. In an electric heater, a heat element mounted substantially about the focus of a reflecting surface, said surface disposed convexly about and to a vertical axis.

14. In an electric heater, a heat element mounted substantially about the focus of a reflecting surface, said surface disposed convexly about and to a vertical axis, and electrical connections to said element.

15. In an electric heater, a heat element mounted substantially about the focus of a reflecting surface, said surface disposed convexly about and to a vertical axis, and electrical connections to said element, and a top and bottom member in engagement with the reflecting surface.

16. In an electric heater, a heat element mounted substantially about thefocus of a reflecting surface, said surface disposed convexly about and to a vertical axis, and electrical connections to said element, and a top and bottom member in engagement with the reflecting surface, and a protective cage inclosing the heat element and reflecting surface substantially as and for the purpose set forth.

17. In an electric heater, a heat element mounted substantially about the focus of a reflecting surface of conoidal form.

In testimony whereof, we have hereunto set our hands at San Francisco, California, this 22nd day of September, 1919.

MILTON H. SHOENBERG. GEO. J. HENRY. 

